Semi-Practical Duration Chart

The T.1 timing data can be used in combination with guide number information to calculate the maximum distance at which one can freeze motion to a given duration. The following chart is for ISO 100 at f/2.8. Multiply the distance by √2 in order to increase ISO or aperture by one stop or conversely divide to go the other direction. It assumes maximum zoom.

Again, please remember that this is based on manufacturer-published data rather than on actual measurements. There's really not going to be any useful way to calculate this without careful hands-on testing and an oscilloscope.

2.8:&cht=lxy&chco=ff9900,3d8bff,ff513d,000000&chdlp=t&chxt=y,x,x&chxl=0:%7C1m%7C2m%7C3m%7C4m%7C5m%7C6m%7C7m%7C8m%7C9m%7C10m%7C11m%7C12m%7C1:%7C0%7C100%CE%BCs%7C200%CE%BCs%7C300%CE%BCs%7C400%CE%BCs%7C500%CE%BCs%7C600%CE%BCs%7C700%CE%BCs%7C800%CE%BCs%7C900%CE%BCs%7C1000%CE%BCs%7C2:%7C%C2%B9%E2%81%84%E2%82%81%E2%82%80%E2%82%80%E2%82%80%7C%C2%B9%E2%81%84%E2%82%82%E2%82%80%E2%82%80%E2%82%80%7C%C2%B9%E2%81%84%E2%82%84%E2%82%80%E2%82%80%E2%82%80%7C%C2%B9%E2%81%84%E2%82%88%E2%82%80%E2%82%80%E2%82%80%7C%C2%B9%E2%81%84%E2%82%81%E2%82%86%E2%82%80%E2%82%80%E2%82%80&chxp=0,1,2,3,4,5,6,7,8,9,10,11,12%7C2,100,50,25,12.5,6.25&chxr=0,0,12.2%7C1,0,1000%7C2,0,100&chds=0,1000,0,12.2,0,1000,0,12.2,0,1000,0,12.2,0,1000,0,12.2,0,1000,0,12.2&&chdl=Metz+48+AF-1%7CMetz+54+MZ-4i%7CMetz+58+AF-1%7CPentax+%28Very+Rough+Estimate%29&chm=o,ff9900,0,-1,9,-1%7Co,ffffff,0,8,9,1%7Co,3d8bff,1,-1,9,-1%7Co,ffffff,1,8,9,1%7Co,ff513d,2,-1,9,-1%7Co,ffffff,2,8,9,1%7Co,ff513d,2,1,9,-1%7Cx,000000,3,0,15,-1&chd=t:-1,40,67,100,167,250,500,1000%7C-1,1.5,2.1,3.0,4.3,6.1,8.6,11.5%7C38,50,77,125,200,333,667,1000%7C1.2,1.7,2.4,3.4,4.8,6.8,9.6,11.0%7C30,45,71,111,182,312,667,1000%7C1.3,1.8,2.6,3.7,5.2,7.3,10.6,12.2%7C150,150%7C2.4,2.4

The ✖ indicates a very rough approximation of the range and duration of the Pentax AF540FGZ at minimum power based on the given T.5 number. (The AF360FGZ estimate is about a tenth of a meter less, and therefore basically in the same approximate range.) This is really just an educated guess, and I only include it at all because Pentax-branded equipment is obviously of particular interest.

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